1分钟系列，常用来定位线上性能问题，希望大家有所收获。如何查看占用CPU最多的进程？方法一核心指令：ps实际指令：psH-eopid,pcpu|排序-nk2|tail执行效果如下：[work@test01~]$psH-eopid,pcpu|排序-nk2|tail313960.6313960.6313960.6313960.6313960.6313960.6313960.6313960.6309041.0309141.0结果：你看，最耗cpu的pid=30914。画外音：其实是31396方法二核心命令：top实际命令：topShift+t找到最耗CPU的进程ID。对应的服务名是什么？方法一核心命令：ps实际命令：psaux|fgreppid执行效果如下：[work@test01~]$psaux|fgrep30914work309141.00.830956871668？SLFeb02124:44./router2–conf=rs.conf结果：你看，进程就是./router2方法2直接查看proc就可以了。实际命令：ll/proc/pid执行效果如下：[work@test01~]$ll/proc/30914lrwxrwxrwx1workwork0Feb1013:27cwd->/home/work/im-env/router2lrwxrwxrwx1workwork0Feb1013:27exe->/home/work/im-env/router2/router2画外音：很好，完整路径出来了。如何查看某个端口的连接状态？方法一核心命令：netstat实际命令：netstat-lap|fgrepport执行效果如下：[work@test01~]$netstat-lap|fgrep22022tcp001.2.3.4:22022*:*收听31396/imuitcp001.2.3.4:220221.2.3.4:46642已建立31396/imuitcp001.2.3.4:220221.2.3.4:220221.2.3.4:46642核心命令：lsof实际命令：lsof-i:port执行效果如下：[work@test01~]$/usr/sbin/lsof-i:22022COMMANDPIDUSERFDTYPEDEVICESIZENODENAMErouter30904work50uIPv469065770TCP1.2.3.4:46638->1.2.3.4:22022(ESTABLISHED)904work3router51uIPv469065772TCP1.2.3.4:46639->1.2.3.4:22022(ESTABLISHED)路由器30904work52uIPv469065774.TCP-4:465774TCP->46639->1.2.3.4:22022.3.4:22022(ESTABLISHED)学习被放弃了吗？
